EFDA Final PT 1 Harcum College questions
with solutions
Cusp - ANSWER An elevation of the crown portion of a tooth making up a divisional part of the
occlusal surface, it is considered to have an apex and four ridges
Ridge - ANSWER Any linear elevation on the surface of a tooth, its name is according to its
location
Marginal ridge - ANSWER Rounded elevated areas of enamel that form the mesial and distal
borders
Triangular ridge - ANSWER Prominent elevations, triangular in cross section, which extend from
the tip of a cusp toward the central portion of the occlusal surface of the tooth.
Transverse ridge - ANSWER The union of two triangular ridges that produces one ridge across
the occlusal surface
Oblique ridge - ANSWER a ridge crossing obliquely the occlusal surfaces of maxillary molars and
formed by the union of the triangular ridge of the distobuccal cusp and the distal cusp ridge of
the mesiolingual cusp
Supplemental groove - ANSWER shallow linear grooves that radiate from the developmental
groove
Lobe - ANSWER A developmental segment of the tooth as they develop they coalesce to form a
single unit
,Mamelon - ANSWER One of the three rounded protuberances of the incisal surface of a newly
erupted incisor tooth.
Cusp ridge - ANSWER Form buccal and lingual margins of occlusal surfaces of posterior teeth
Incisal ridge - ANSWER Rounded ridge form of the incisal portion of an anterior tooth.
Cingulum - ANSWER Raised, rounded area on the cervical third of the lingual surface
Cusp of carabelli - ANSWER the fifth cusp located on the mesiolingual surface of maxillary first
molars
Fissure - ANSWER an opening; a groove; a split
Fossa - ANSWER Relatively deep pit or depression
Lingual fossa - ANSWER a broad shallow depression on the lingual surface of an incisor or canine
Central fossa - ANSWER a relatively broad, deep angular valley in the central portion of the
occlusal surface of a molar
Groove - ANSWER A small linear depression on the surface of a tooth
Developmental groove - ANSWER Groove formed by the uniting of lobes during development of
the crown of the tooth
Cervical - ANSWER Where the crown meets the tooth
, Embrasures - ANSWER Triangular space in a gingival direction between the proximal surfaces of
two adjoining teeth in contact.
Dentin - ANSWER Primary material found in teeth. It is covered by the enamel in the crown and
a protective layer of cementum in the root.
Cementum - ANSWER Specialized, calcified connective tissue that covers the anatomic root of a
tooth.
Axial - ANSWER Internal parallel to the long axis of the tooth
Contact area - ANSWER Area of the mesial or distal surface of a tooth that touches the adjacent
tooth in the same arch
Concavities - ANSWER A hollowed or rounded inward shape, tend to cause shadows on the
surface of teeth.
Convexities - ANSWER Curved or rounded outward like the surface of a sphere
Furcation - ANSWER dividing point of a multi-rooted tooth
Height of contour - ANSWER The greatest distance around a tooth; cervical third
Proximal - ANSWER Closer to the point of attachment
Inclined plane - ANSWER a flat, sloped surface
with solutions
Cusp - ANSWER An elevation of the crown portion of a tooth making up a divisional part of the
occlusal surface, it is considered to have an apex and four ridges
Ridge - ANSWER Any linear elevation on the surface of a tooth, its name is according to its
location
Marginal ridge - ANSWER Rounded elevated areas of enamel that form the mesial and distal
borders
Triangular ridge - ANSWER Prominent elevations, triangular in cross section, which extend from
the tip of a cusp toward the central portion of the occlusal surface of the tooth.
Transverse ridge - ANSWER The union of two triangular ridges that produces one ridge across
the occlusal surface
Oblique ridge - ANSWER a ridge crossing obliquely the occlusal surfaces of maxillary molars and
formed by the union of the triangular ridge of the distobuccal cusp and the distal cusp ridge of
the mesiolingual cusp
Supplemental groove - ANSWER shallow linear grooves that radiate from the developmental
groove
Lobe - ANSWER A developmental segment of the tooth as they develop they coalesce to form a
single unit
,Mamelon - ANSWER One of the three rounded protuberances of the incisal surface of a newly
erupted incisor tooth.
Cusp ridge - ANSWER Form buccal and lingual margins of occlusal surfaces of posterior teeth
Incisal ridge - ANSWER Rounded ridge form of the incisal portion of an anterior tooth.
Cingulum - ANSWER Raised, rounded area on the cervical third of the lingual surface
Cusp of carabelli - ANSWER the fifth cusp located on the mesiolingual surface of maxillary first
molars
Fissure - ANSWER an opening; a groove; a split
Fossa - ANSWER Relatively deep pit or depression
Lingual fossa - ANSWER a broad shallow depression on the lingual surface of an incisor or canine
Central fossa - ANSWER a relatively broad, deep angular valley in the central portion of the
occlusal surface of a molar
Groove - ANSWER A small linear depression on the surface of a tooth
Developmental groove - ANSWER Groove formed by the uniting of lobes during development of
the crown of the tooth
Cervical - ANSWER Where the crown meets the tooth
, Embrasures - ANSWER Triangular space in a gingival direction between the proximal surfaces of
two adjoining teeth in contact.
Dentin - ANSWER Primary material found in teeth. It is covered by the enamel in the crown and
a protective layer of cementum in the root.
Cementum - ANSWER Specialized, calcified connective tissue that covers the anatomic root of a
tooth.
Axial - ANSWER Internal parallel to the long axis of the tooth
Contact area - ANSWER Area of the mesial or distal surface of a tooth that touches the adjacent
tooth in the same arch
Concavities - ANSWER A hollowed or rounded inward shape, tend to cause shadows on the
surface of teeth.
Convexities - ANSWER Curved or rounded outward like the surface of a sphere
Furcation - ANSWER dividing point of a multi-rooted tooth
Height of contour - ANSWER The greatest distance around a tooth; cervical third
Proximal - ANSWER Closer to the point of attachment
Inclined plane - ANSWER a flat, sloped surface
